Display panel or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence for a display panel or portion thereof with transitional graphical user interface, showing our new design.

FIG. 2 is a front view of a second image in the sequence thereof; and,

FIG. 3 is a front view of a third image in the sequence thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-3. The process or period in transitions between images forms no part of the claimed design.

The broken lines showing a portion of a display panel or portion thereof with transitional graphical user interface in FIGS. 1-3 form no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with transitional graphical user interface, substantially as shown and described. 